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最高额房产抵押担保的个人授信额度循环贷款上限，按照客户类型，私营企业为（），大中型企业员工为（），公务员为（）。
A. 500万元
B. 300万元
C. 200万元
D. 100万元
Your developers have asked you to restore the development database， which is in NOARCHIVELOG mode， back to last Tuesday the 20th. Your last backup is from Monday the 19th. What do you do？（）
A. Restore the 19ths backup， restore all archived redo logs， recover the database to the 20th，and open the database.
B. Tell them that their request cannot be met with the current backup strategy.
C. Restore the 19ths backup， apply the online redo logs，and open the database.
D. Switch the database into ARCHIVELOG mode，restore the 19th’s backup，restore all archived redo logs，and recover the database to the 20th.
E. Use the recover database command to roll back the database from today to the 19th of the month.
What is the objective of Diffie-Hellman？（）
A. used to verify the identity of the peer
B. used between the initiator and the responder to establish a basic security policy
C. used to establish a symmetric shared key via a public key exchange process
D. used for asymmetric public key encryptio
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